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Finding the Fourth Proportional to 1,011.99, 1,394.90 and 790.56

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Solution

The fourth proportional to 1,011.99, 1,394.90 and 790.56 is: 1,089.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.99 : 1,394.90 = 790.56 : x
  2. Step 2: Convert to fraction form
    1,011.99/1,394.90 = 790.56/x
  3. Step 3: Cross multiply
    1,011.99x = 1,394.90 × 790.56
  4. Step 4: Simplify right side
    1,011.99x = 1,102,745.17
  5. Step 5: Solve for x
    x = 1,102,745.17/1,011.99
  6. Step 6: Final answer
    x = 1,089.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.